Coin Cell Sealing Structure for More Internal Battery Space
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Solution Overview
Problem
Coin-shaped batteries have a limited internal space due to the necessity of a relatively thick gasket for compression, which occupies part of the internal space and restricts the battery's capacity.
Innovation Solution
The design includes a gasket with a thickness less than the second wall portion, which is compressed between the case and the sealing plate, allowing for a wider compression area and increasing the internal space without compromising the hermetic seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relatively thick gasket is used to achieve sufficient compression rates, then hermetic sealing is improved, but internal space of the battery is reduced
Solution Approach 1:
The circumferential edge portion is divided into multiple wall portions (first wall portion, second wall portion, third wall portion) with different functions. The second wall portion specifically compresses the gasket to provide hermetic sealing, while other wall portions serve different purposes, allowing the gasket to be thinner overall while maintaining sealing effectiveness.
Solution Approach 2:
Different wall portions are designed with different thicknesses and positions to perform different functions. The second wall portion is positioned and dimensioned specifically to compress the gasket adequately, while other portions have different characteristics. This localized optimization allows sufficient compression at the sealing location without requiring a uniformly thick gasket throughout, thereby increasing internal space.
2Volume of stationary object
If a thinner gasket is used to increase internal space, then battery capacity is improved, but hermetic sealing may be compromised
Solution Approach 1:
The circumferential edge portion is segmented into multiple functional wall portions. The second wall portion is specifically designed to compress the gasket, ensuring hermetic sealing even when the overall gasket thickness is reduced. This segmentation allows the gasket to be thinner in non-critical areas while maintaining adequate thickness and compression in the sealing-critical region.
Solution Approach 2:
The gasket and circumferential edge portion are designed with localized quality variations. The second wall portion provides focused compression on the gasket at the sealing location, ensuring adequate sealing pressure even with a thinner overall gasket. This localized compression approach maintains hermetic sealing reliability while allowing reduced gasket thickness elsewhere to increase internal space.
3Stability of the object's composition
If uniform compression is applied across the gasket, then sealing consistency is improved, but internal space is reduced due to thicker gasket requirements
Solution Approach 1:
The circumferential edge portion is segmented into multiple wall portions with different positions and functions. The second wall portion provides targeted compression at the sealing location, while other wall portions serve different purposes. This segmentation enables consistent sealing at the critical interface without requiring uniform thick compression across the entire gasket, thereby optimizing internal space.
Solution Approach 2:
Different wall portions are designed with different local qualities (thickness, position, compression force) to perform different functions. The second wall portion is optimized for gasket compression and sealing consistency, while other portions have different characteristics. This localized optimization achieves consistent sealing where needed without requiring a uniformly thick gasket design, preserving internal space.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the internal space of the coin-shaped battery, increasing its capacity while maintaining an effective hermetic seal, even in low-temperature environments where gasket shrinkage may occur.
Implementation Method 1
The gasket is compressed and interposed between the side wall and the circumferential edge portion
Data Source
AI summary
A coin-shaped battery includes a power generation element and an outer housing hermetically accommodating the power generation element therein. The outer housing includes a case having an outer surface including a first terminal surface, a sealing plate having an outer surface including a second terminal surface, and a gasket. The case includes a bottom plate and a side wall. The sealing plate includes a top plate and a circumferential edge portion. The gasket is compressed and interposed between the side wall and the circumferential edge portion. The circumferential edge portion includes: a first wall portion extending in a direction from the top plate toward the bottom plate; a second wall portion extending in a direction from the bottom plate toward the top plate to compress the gasket between the second wall portion and the side wall; and a fold-back portion connecting the first wall portion to the second wall portion. A space is provided between the first wall portion and the second wall portion. A thickness of the gasket before compression is less than a thickness of the second wall portion.